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Arduino Articles
Page 3 of 18
Arduino Uno vs Arduino Mega
We will have a comparison of the specifications of Arduino Uno and the Arduino Mega Board.Arduino UnoArduino MegaPlease refer to the table below −Dimensions Pricing I/O PinsUnoMegaGeneralDimensions2.7¨ x 2.1¨4¨ x 2.1¨Pricing$20-23$36-39ConnectivityI/O Pins1454PWM Pins615Analog Pins616ComputingProcessorATMega328PATmega2560Flash Memory32 kB256 kBSRAM2 kB8 kBEEPROM1 kB4 kBClock speed16 MHz16 MHzVoltage Level5V5VUSB ConnectivityStandard A/B USBStandard A/B USBCommunicationHardware Serial Ports14SPI SupportYesYesI2C SupportYesYes
Read MoreComponents of Arduino Uno board
The important components of the Arduino Uno Board are shown below −The following table contains the description for each of the labels −LabelDescription17-12 V Barrel Jack2Voltage Regulator316 MHz Crystal Oscillator4USB - B Port5Reset Button6Digital Pins7ICSP Pins (SPI can be accessed from here)8ATmega328P microcontroller9Analog Pins10Serial Port TX RX LEDs11USB to UART Conversion IC12Built-in LED (connected to pin 13)
Read MoreInterface Arduino with Gas Sensor
In this article, we will see how to interface Arduino with the MQ-2 gas sensor. MQ2 gas sensor is used for detecting smoke and some flammable gases like LPG, Methane, etc. It changes its resistance depending on the type of the gas. This principle can be used to raise an alarm based on the concentration of the gas.An image of the MQ2 gas sensor is given above. As you can see, it has 4 pins. Out of these the Aout pin gives the Analog voltage in proportion to the gas concentration. Higher the gas concentration, higher the voltage on the ...
Read MoreInterface Arduino with LoRa module
In this article we will see how to interface Arduino with the LoRa module E32. LoRa stands for Long Range. It uses license-free sub-GHz RF bands for operation. These bands are different in different countries. In India, the permissible band is 865-867 MHz. LoRa is very ideal for IoT applications thanks to its long range and low power consumption. However, the achievable data rates are limited (0.3 to 27 kbits/second). Longer the range, lower the data rate.The E32 module that we will use looks like the one below. Depending on the frequency the module variant changes. For example, the one ...
Read MoreInterface Zigbee with Arduino
Zigbee is a wireless communication protocol targeted for battery powered devices (it has both low power and low cost). It generally operates in the 2.4GHz range (although there are geographic variations), and supports data ranges from 20 to 250 kbits/s.The transmission distance though, is small compared to the likes of LoRa. It is 10 to 100 m, whereas LoRa can transmit over a few kilometers. Another thing to note is that Zigbee communication doesn’t work very well if there is no line of sight between transmitter and receiver.Even minor obstacles have been observed to significantly degrade the communication. Keep these ...
Read MoreSend SMS using a GSM module connected to Arduino
In this article, we will see how to interface Arduino with a GSM Module, and send SMS using the module. You will need the following −Arduino boardA GSM Module (SIM800C, SIM900A, are popular examples, but you can have any other module as well)A GSM (2G) SIM Card, or a 4G SIM Card with 2G fallback option (Jio SIM Cards won’t work for this project)GSM AntennaYou could also get a GSM Module development board, like the one below (the SIM Card Holder is on the other side of the board) −A GSM Module interacts with a microcontroller via UART (see the ...
Read MoreQueue in FreeRTOS in Arduino
Queue is a data structure that helps exchange data between different tasks or between tasks and interrupts. It holds a finite number of items (defined at the time of initialization) and operates in the FIFO mode.We will walk through an example that comes in with the FreeRTOS library, to understand queues.You can find the example in − File → Examples → FreeRTOS → StructQueue.In this code, two tasks read analog values from different analog pins, and pass these values in a queue. Another task reads the values from the queue and prints them onto the Serial Monitor. There is a ...
Read MoreSoftware Serial in Arduino
The SoftwareSerial library was developed to ensure that any pins of Arduino can exchange Serial data with other peripherals, like GNSS receivers, using software. Arduino Uno, for example, has only one HardwareSerial port (pins 0 and 1), which is connected to the USB via the USB to UART conversion chip. Thus, if you have any other peripheral that requires serial communication, in the absence of SoftwareSerial, you’d have to do away with USB Serial communication.SoftwareSerial has some limitations −If you are using multiple SoftwareSerial ports, only one can receive data at a timeSpeeds can be up to a maximum of ...
Read More5 Arduino Project Problem Statements for Beginners
If you are starting off with Arduino, then the following 5 projects can be taken up by you −7-segment display using ArduinoInterface a 7-segment display with Arduino and count from 0 to 9 on that display. This will help you get a good understanding of GPIOsAs a next step, you can interface Arduino with a potentiometer, and display the truncated voltage value (read using ADC) on the 7 segment display.Fire Alarm SystemInterface the Arduino with a smoke detector or a flame sensor and a buzzer to give a warning as soon as the readings from the smoke detector cross a ...
Read MorePopular boards that can be programmed using Arduino IDE
Here are some popular boards that can be programmed using Arduino IDE −ESP8266This board is used primarily for IoT applicationsIt has WiFi and BlueTooth capabilitiesTo make this compatible with Arduino IDE, the following JSON has to be added to File → Preferences → Additional Boards Manager URLs −Next, you need to go to Tools → Boards Manager, search for ESP8266 and install this board.ESP32This is an upgrade over ESP8266It comes with two cores (supporting dual core operation) and in general has superior specs over ESP32There are various variants of this board, some like the TTGO Board even having OLED, LoRa ...
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